Steve and Cheapo,
Forgive me for not trying to reply to your separate posts in a single message. As you don't give your e-mail addresses I can't reply to you individually as I would prefer to do, as it's difficult to respond to all of the points you make this way.
I did receive a reply, from a Sierra representive, who stated that the bullet has been used in carbines with various results (I would be happy to forward it to you), if you would e-mail me. And I would answer your posts point by point.